Abstract: A bubble generator for a washing machine which utilizes bellows and an actuating cam for actuating the bellows is disclosed. The bubble generator includes a housing and a body installed within the housing. The body includes inlets for inflow of air at one side thereof, outlets for outflow of air at the other side thereof and passages for communicating the inlets with the outlets. Partitions for closing said passages are formed on the way of the passages, and spaces for expanding compressed air are formed adjacent to the outlets. An opposite pair of bellows are provided on an inner wall of the body. A plurality of holes are formed at the inner wall, one half of holes being for inflow of air into the pair of bellows, the other half of holes being for outflow of air out of the pair of bellows. An actuating cam for vibrating the pair of bellows by rotation is provided between the pair of bellows.